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Note Premises and equipment - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Premises And Equipmen Additional Information [Abstract] |  |  |
Depreciation, Depletion and Amortization | $ 52.5 | $ 47.1 | $ 45.7
Occupancy Expense | 24.3 | 22.4 | 21.4
Equipment Communications And Other Operating Expenses | 28.2 | 24.7 | 24.3
Rental Income | $ 28.2 | $ 26.6 | $ 27.8

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- References No definition available. + Details
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- Definition Depreciation and Amortization of Equipment, Communications and Other Operating Expenses recognized in the current period + References No definition available. + Details
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- Definition Depreciation and Amortization of Occupancy expense recognized in the current period + References No definition available. + Details
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- Definition Rental Income recognized in the current period + References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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